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Insect Pests on Fruits

Apple Maggot
Cherry Fruit Fly
Gooseberry Sawfly
Saskatoon Sawfly
Wasp Damage

For all chemical controls, READ AND FOLLOW LABEL INSTRUCTIONS THOROUGHLY BEFORE USE.


 
 
 
 
 
 
Apple Maggot

Plants affected - Apple, Evans Cherry, Hawthorn. Worse on early ripening apples.

Life Cycle:

  • Adults lay eggs in fruit early to mid July. Maggots make trails rendering fruit inedible (outside pockmarked)
  • Larvae drop to ground and pupate until the next June - July

Cultural Control:

  • Lay a barrier (landscape fabric, remay cloth) on top of soil under the tree—this prevents pupae from emerging from soil, as well as larvae entering soil in fall.
  • Apple Maggot Traps—hang in trees in mid-late May. Traps contain a pheromone to lure adults. Average emergence date in Alberta is July to August.
  • DO NOT allow fruit to lay on ground (use tarp or pick daily)

Chemical Control - None


 

 

 
 
 
 
Cherry Fruit Fly

Plants affected - Cherry

Symptoms - Larvae (maggots) feed in the flesh near the pit of cherries rendering them inedible.

Life Cycle:

  • Overwinter as pupae in soil under trees. Five to 9 days after emerging, adult female flies lay eggs singly in cherries.
  • Larvae feed for 1-2 weeks then cut exit hole and drop to ground to pupate.
  • Adults are present from June through August, generally peaking close to harvest. Flies are weak and will usually not travel farther than the first cherry tree they find.

Cultural Control - Hang yellow sticky traps in late May in trees to monitor fly emergence (for spraying date) and to trap adults.

Chemical Control - Sevin. Apply first spray no later than 6 days after capture of the first fly (on traps) followed by sprays at recommended intervals.


 
 
 
 
 
 
Gooseberry Sawfly

Plants affected - Red and White Currants (not black), Gooseberry

Symptoms - Leaves stripped from branches; fruit is not affected.

Life Cycle:

  • Female lays eggs on underside of leaf close to ground; young larvae make holes in leaves, as they mature damage becomes more severe; leaves are entirely stripped from shrub.
  • Overwinter in soil as a cocoon.

Cultural Control:

  • Examine leaves in May; look for white eggs low down in center of the bush, remove leaves.
  • Clear away debris and mulch in the fall, and disturb the soil in spring so birds will find them.

Chemical Control - Not recommended once larvae seen; try to destroy eggs early on.


Saskatoon Sawfly

Plants affected - Saskatoon

Symptoms:

  • Small scars on upper part of green berries. Larger fruit may have holes.
  • Later in season fruit may appear as empty black shells.

Life Cycle:

  • Adults emerge in May, lay eggs on flowers. Eggs hatch, larvae emerge and feed on fruit.
  • In late June, larvae drop to ground and overwinter in soil.

Cultural Control - Look for adult sawflies when blooms emerge; hand-pick.

Chemical Control - Try a soil drench of Neem Oil in early May to treat larvae before emerging.


 
 
 
 
 
 
Wasp Damage

Plants affected - Soft skinned fruits

Symptoms - Clear sap oozing from sides of fruit

Control - Cover smaller trees with remay cloth as fruit is ripening, hang traps filled with sugar water/juice to distract wasps.